JP2000178064A - Gypsum hardened body - Google Patents
Gypsum hardened bodyInfo
- Publication number
- JP2000178064A JP2000178064A JP35730198A JP35730198A JP2000178064A JP 2000178064 A JP2000178064 A JP 2000178064A JP 35730198 A JP35730198 A JP 35730198A JP 35730198 A JP35730198 A JP 35730198A JP 2000178064 A JP2000178064 A JP 2000178064A
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- polyvinyl alcohol
- water
- cured
- fluorine compound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Panels For Use In Building Construction (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、石膏硬化物に関
し、更に詳しくは、撥水性、防汚性、寸法安定性、湿潤
時の機械的強度に優れた石膏硬化物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cured gypsum product, and more particularly to a cured gypsum product having excellent water repellency, antifouling property, dimensional stability, and mechanical strength when wet.
【０００２】[0002]
【従来の技術】硫酸カルシウムを主成分とする石膏硬化
物は、従来より石膏ボード等に成形されて建築用材料な
どに多用されている。また、石膏とその他の材料を水と
共に混練して泥状物とした石膏プラスターは、建築用左
官材料として壁の上塗りやボードの接着剤として用いら
れている。かかる石膏ボードや石膏プラスター等の石膏
硬化物に要求される性能としては、機械的強度、寸法安
定性、軽量化、デザイン性、（鋸かけや釘打ちや鉋かけ
時の）二次加工性等であり、かかる要求性能の向上を目
指して、特公昭４９−３７１０５号公報には、石膏、
水、高分子物質（ポリビニルアルコール系樹脂等）、繊
維状充填材から石膏成形物を製造することが記載されて
いる。2. Description of the Related Art A hardened gypsum containing calcium sulfate as a main component has been conventionally formed into a gypsum board or the like and is often used as a building material. Gypsum plaster made by mixing gypsum and other materials together with water to obtain a muddy material is used as a plastering material for building and as a top coat for walls and as an adhesive for boards. The performance required for such a gypsum cured product such as gypsum board and gypsum plaster includes mechanical strength, dimensional stability, weight reduction, design, secondary workability (when sawing, nailing, or planing). In order to improve the required performance, Japanese Patent Publication No. 49-37105 discloses gypsum,
It is described that a gypsum molded product is produced from water, a polymer substance (such as a polyvinyl alcohol-based resin), and a fibrous filler.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記の
成形物は、ポリビニルアルコール系樹脂等の高分子物質
を配合しているため、湿潤時の強度低下や寸法変化が大
きく、また、目地などの表面露出部分が汚れやすいとい
う問題点を有しており、撥水性、防汚性、寸法安定性、
湿潤時の機械的強度等に優れた石膏硬化物が望まれると
ころである。However, since the above-mentioned molded product contains a polymer substance such as a polyvinyl alcohol resin, the strength is greatly reduced when wet and the dimensional change is large. There is a problem that the exposed part is easily stained, and water repellency, stain resistance, dimensional stability,
There is a need for a gypsum cured product having excellent mechanical strength when wet.
【０００４】[0004]
【問題を解決するための手段】そこで、本発明者は、か
かる事情を鑑みて鋭意研究を重ねた結果、石膏、ポリビ
ニルアルコール系樹脂及びフッ素系化合物を含有してな
る石膏硬化物が上記の課題を解決することを見いだし本
発明を完成するに至った。Means for Solving the Problems Accordingly, the present inventor has conducted intensive studies in view of such circumstances, and as a result, a gypsum cured product containing gypsum, a polyvinyl alcohol-based resin and a fluorine-based compound has the above-mentioned problems. And found that the present invention was completed.
【０００５】[0005]
【発明の実施の形態】本発明を以下に詳しく説明する。
本発明に用いられる石膏は、特に限定されず、通常の石
膏ボード等に用いられる石膏を用いれば良く、一般的に
は半水石膏（ＣａＳＯ4・1/2Ｈ2Ｏ）や無水石膏（Ｃａ
ＳＯ4）等が用いられる。DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below.
The gypsum used in the present invention is not particularly limited, and gypsum used for a normal gypsum board or the like may be used. Generally, hemihydrate gypsum (CaSO 4 .1 / 2H 2 O) or anhydrous gypsum (Ca
SO 4 ) or the like is used.
【０００６】また、ポリビニルアルコール系樹脂として
も特に限定されず、一般的にはポリ酢酸ビニルの低級ア
ルコール溶液をアルカリや酸などのケン化触媒によって
ケン化したケン化物又はその誘導体が用いられ、更には
酢酸ビニルと共重合性を有する単量体と酢酸ビニルとの
共重合体のケン化物等を用いることもでき、該単量体と
しては、例えばエチレン、プロピレン、イソブチレン、
α−オクテン、α−ドデセン、α−オクタデセン等のオ
レフィン類、アクリル酸、メタクリル酸、クロトン酸、
マレイン酸、無水マレイン酸、イタコン酸等の不飽和酸
類あるいはその塩あるいはモノ又はジアルキルエステル
等、アクリロニトリル、メタアクリロニトリル等のニト
リル類、アクリルアミド、メタクリルアミド等のアミド
類、エチレンスルホン酸、アリルスルホン酸、メタアリ
ルスルホン酸等のオレフィンスルホン酸あるいはその
塩、アルキルビニルエーテル類、Ｎ−アクリルアミドメ
チルトリメチルアンモニウムクロライド、アリルトリメ
チルアンモニウムクロライド、ジメチルジアリルアンモ
ニウムクロリド、ジメチルアリルビニルケトン、Ｎ−ビ
ニルピロリドン、塩化ビニル、塩化ビニリデン、ポリオ
キシエチレン（メタ）アリルエーテル、ポリオキシプロ
ピレン（メタ）アリルエーテルなどのポリオキシアルキ
レン（メタ）アリルエーテル、ポリオキシエチレン（メ
タ）アクリレート、ポリオキシプロピレン（メタ）アク
リレート等のポリオキシアルキレン（メタ）アクリレー
ト、ポリオキシエチレン（メタ）アクリルアミド、ポリ
オキシプロピレン（メタ）アクリルアミド等のポリオキ
シアルキレン（メタ）アクリルアミド、ポリオキシエチ
レン（１−（メタ）アクリルアミド−１，１−ジメチル
プロピル）エステル、ポリオキシエチレンビニルエーテ
ル、ポリオキシプロピレンビニルエーテル、ポリオキシ
エチレンアリルアミン、ポリオキシプロピレンアリルア
ミン、ポリオキシエチレンビニルアミン、ポリオキシプ
ロピレンビニルアミン等が挙げられるが、好適には酢酸
ビニルの単独重合体のケン化物、酢酸ビニルとエチレ
ン，不飽和酸或いはその塩，アルキルエステル及びオレ
フィンスルホン酸或いはその塩との共重合体のケン化物
が用いられる。The polyvinyl alcohol-based resin is not particularly limited, and a saponified product or a derivative thereof obtained by saponifying a lower alcohol solution of polyvinyl acetate with a saponification catalyst such as an alkali or an acid is generally used. Can also be used a saponified product of a copolymer of vinyl acetate and a monomer having copolymerizability with vinyl acetate, such as ethylene, propylene, isobutylene,
α-octene, α-dodecene, olefins such as α-octadecene, acrylic acid, methacrylic acid, crotonic acid,
Maleic acid, maleic anhydride, unsaturated acids such as itaconic acid or salts or mono- or dialkyl esters thereof, acrylonitrile, nitriles such as methacrylonitrile, acrylamide, amides such as methacrylamide, ethylenesulfonic acid, allylsulfonic acid, Olefinsulfonic acids such as methallylsulfonic acid or salts thereof, alkyl vinyl ethers, N-acrylamidomethyltrimethylammonium chloride, allyltrimethylammonium chloride, dimethyldiallylammonium chloride, dimethylallylvinylketone, N-vinylpyrrolidone, vinyl chloride, vinylidene chloride Polyoxyalkylene (meth) allyl such as polyoxyethylene (meth) allyl ether and polyoxypropylene (meth) allyl ether , Polyoxyalkylene (meth) acrylates such as polyoxyethylene (meth) acrylate and polyoxypropylene (meth) acrylate; polyoxyalkylene (meth) such as polyoxyethylene (meth) acrylamide and polyoxypropylene (meth) acrylamide Acrylamide, polyoxyethylene (1- (meth) acrylamide-1,1-dimethylpropyl) ester, polyoxyethylene vinyl ether, polyoxypropylene vinyl ether, polyoxyethylene allylamine, polyoxypropylene allylamine, polyoxyethylene vinylamine, polyoxy Examples include propylene vinylamine and the like, preferably saponified vinyl acetate homopolymer, vinyl acetate and ethylene, an unsaturated acid or a salt thereof, and an alkyl ester. Ether and olefin sulfonic acid or saponified product of a copolymer of a salt thereof is used.
【０００７】ポリビニルアルコール系樹脂のケン化度や
平均重合度も特に限定されないが、ケン化度は７０モル
％以上（更には８０〜９９．５モル％）が好ましく、か
かるケン化度が７０モル％未満では、機械的強度の向上
が見られず、また、平均重合度は２００〜３０００（更
には５００〜２５００）が好ましく、かかる重合度が２
００未満では泥状物の粘度が低くなりすぎて石膏の沈降
が起こり、逆に３０００を越えると泥状物の粘度が上が
りすぎて混練作業や型への流し込み・盛りつけ作業が困
難となって好ましくない。Although the degree of saponification and the average degree of polymerization of the polyvinyl alcohol resin are not particularly limited, the degree of saponification is preferably 70 mol% or more (more preferably 80 to 99.5 mol%). %, No improvement in mechanical strength is observed, and the average degree of polymerization is preferably 200 to 3000 (more preferably 500 to 2500).
If it is less than 00, the viscosity of the mud becomes too low, causing gypsum to settle. Conversely, if it exceeds 3,000, the viscosity of the mud becomes too high, which makes kneading work and casting / placing work difficult, which is preferable. Absent.
【０００８】本発明においては、上記の石膏及びポリビ
ニルアルコール系樹脂に加えて、更にフッ素系化合物を
配合することを最大の特徴とするもので、かかる化合物
としては、パーフルオロアルキル基（ＣnＦ2n+1−；ｎ
は１〜４０の整数）を含有する化合物を挙げることがで
き、好適にはパーフルオロアルキルアクリレートセグメ
ント及び／又はパーフルオロアルキルウレタンセグメン
トを含有するポリマーやオリゴマー等の水系エマルジョ
ンが用いられる。The most important feature of the present invention is that a fluorine-based compound is further compounded in addition to the above-mentioned gypsum and polyvinyl alcohol-based resin. Such a compound includes a perfluoroalkyl group (C n F 2n + 1- ; n
Is an integer of 1 to 40), and an aqueous emulsion such as a polymer or oligomer containing a perfluoroalkyl acrylate segment and / or a perfluoroalkyl urethane segment is preferably used.
【０００９】本発明の石膏硬化物中の各成分の含有量は
特に限定されないが、通常は石膏１００重量部に対し
て、ポリビニルアルコール系樹脂が１〜３０重量部（更
には５〜２０重量部）が好ましく、かかるは含有量が１
重量部未満では添加による機械的強度の向上が望めず、
逆に３０重量部を越えると泥状物としたときの粘度が上
がりすぎて好ましくなく、また、フッ素系化合物はポリ
ビニルアルコール系樹脂１００重量部に対して、１〜５
重量部（更には２〜３重量部）が好ましく、かかるは含
有量が１重量部未満では撥水性、防汚性、寸法安定性、
湿潤時の機械的強度等の本発明の目的とする改善効果が
得られず、逆に５重量部を越える量を添加してもそれ以
上の改善効果は期待できず経済的に不利となって好まし
くない。The content of each component in the gypsum cured product of the present invention is not particularly limited, but usually 1 to 30 parts by weight of polyvinyl alcohol resin (more preferably 5 to 20 parts by weight) per 100 parts by weight of gypsum. ) Is preferable, and the content thereof is 1
If the amount is less than parts by weight, improvement in mechanical strength due to addition cannot be expected,
Conversely, if the amount exceeds 30 parts by weight, the viscosity of the slurry becomes too high, which is not preferable, and the fluorine-based compound is 1 to 5 parts by weight based on 100 parts by weight of the polyvinyl alcohol-based resin.
Parts by weight (more preferably 2 to 3 parts by weight), and when the content is less than 1 part by weight, water repellency, stain resistance, dimensional stability,
The desired improvement effect of the present invention, such as mechanical strength when wet, cannot be obtained. Conversely, even if added in an amount exceeding 5 parts by weight, no further improvement effect can be expected, and it is economically disadvantageous. Not preferred.
【００１０】次に、本発明の石膏硬化物の製造法につい
て説明する。本発明の石膏硬化物は、上記の石膏、ポリ
ビニルアルコール系樹脂及びフッ素系化合物の３成分が
含有されていれば良く、該３成分が混合された状態で硬
化物となっていても良いし、或いは石膏及びポリビニル
アルコール系樹脂の硬化物の表面にフッ素系化合物が塗
布或いは含浸されていてもよく、本発明の効果を得るた
めには、該３成分が混合された状態で硬化物とすること
が好ましく、かかる方法について説明するが、これに限
定されるものではない。Next, the method for producing the gypsum cured product of the present invention will be described. The gypsum cured product of the present invention may contain the three components of the gypsum, the polyvinyl alcohol-based resin and the fluorine-based compound, and may be a cured product in a state where the three components are mixed. Alternatively, the surface of a cured product of gypsum and a polyvinyl alcohol-based resin may be coated or impregnated with a fluorine-based compound. In order to obtain the effects of the present invention, the cured product should be formed in a state where the three components are mixed. Is preferred, and such a method will be described, but is not limited thereto.
【００１１】石膏硬化物を得るには、該３成分及び水、
必要により後述の各種添加物の混合物（泥状物）を硬化
させれば良く、例えば、３成分、水、（必要に応じ
て）各種添加物を一括で混合する方法、３成分、（必
要に応じて）各種添加物を混合後に水を加える方法、
石膏とポリビニルアルコール系樹脂、（必要に応じて）
各種添加物を粉体状で混合しておき、現場で水及びフッ
素系化合物を混合する方法等を挙げることができ、通常
は水系エマルジョンタイプのフッ素系化合物を用いるた
め、これを水と同時に添加することが好ましく、及び
の方法が好適に用いられる。To obtain a gypsum cured product, the three components and water,
If necessary, a mixture (mud) of various additives described below may be cured. For example, three components, water, (if necessary) a method of collectively mixing various additives, three components, (According to) adding water after mixing various additives,
Gypsum and polyvinyl alcohol-based resin, (if necessary)
Various additives can be mixed in powder form, and a method of mixing water and a fluorine-based compound on site can be mentioned. Usually, since an aqueous emulsion-type fluorine-based compound is used, this is added simultaneously with water. It is preferable to use the above method.
【００１２】更に本発明においては、本発明の目的を阻
害しない範囲において、繊維状充填材（ガラス繊維、石
綿、ナイロン、ビニロン、ポリエステル、塩化ビニル、
塩化ビニリデン、ポリプロピレン、セルロース、羊毛
等）、骨材（砂、小石等）、軽量骨材（鋸屑、パーライ
ト、膨張ひる石、シラスバルーン等）、消泡剤、顔料、
硬化促進剤などの添加物を添加することができる。上記
の如く得られた混合物（泥状物）は、所定の型に流し込
まれて、室温程度の雰囲気中で１０分〜２４時間程度放
置されて固化し、その後脱型されて１００〜１８０℃
で、１〜３時間程度加熱・乾燥処理をされて、石膏ボー
ド等の石膏硬化物となる。In the present invention, fibrous fillers (glass fiber, asbestos, nylon, vinylon, polyester, vinyl chloride,
Vinylidene chloride, polypropylene, cellulose, wool, etc.), aggregates (sand, pebbles, etc.), lightweight aggregates (sawdust, pearlite, expanded vermiculite, shirasu balloon, etc.), defoamers, pigments,
Additives such as curing accelerators can be added. The mixture (sludge) obtained as described above is poured into a predetermined mold, allowed to stand in an atmosphere at about room temperature for about 10 minutes to 24 hours to solidify, and then demolded to 100 to 180 ° C.
Then, a heating and drying treatment is performed for about 1 to 3 hours to form a gypsum cured product such as a gypsum board.
【００１３】尚、上記の如く、石膏硬化物の表面にフッ
素系化合物を塗布或いは含浸させるにあたっては、通常
１〜１０重量％程度の水性液を用いればよい。また、上
記及びの方法で得た混合物を石膏プラスターとして
用いる場合には、これをコンクリートや木材等の下地に
塗工し、室温にて数日以上養生して完全に硬化させるこ
とが好ましい。かくして得られた石膏硬化物は、撥水
性、防汚性、寸法安定性、湿潤時の機械的強度等に優
れ、建築用の石膏ボード、石膏プラスター等に利用する
ことができる。As described above, in coating or impregnating the surface of the cured gypsum with a fluorine-based compound, an aqueous liquid of usually about 1 to 10% by weight may be used. When the mixture obtained by the above method is used as a plaster plaster, it is preferably applied to a base such as concrete or wood, cured at room temperature for several days or more, and completely cured. The cured gypsum product thus obtained is excellent in water repellency, antifouling property, dimensional stability, mechanical strength when wet, and the like, and can be used for gypsum boards and gypsum plasters for construction.
【００１４】[0014]
【実施例】以下、本発明について実施例を挙げて更に詳
しく説明する。尚、例中に断りのない限り、「％」、
「部」とあるのは、重量基準を示す。 実施例１ フッ素系化合物の水系エマルジョン（パーフルオロアル
キルアクリレート−パーフルオロアルキルウレタンコポ
リマー、固形分２０％；住友スリーエム社製「スコッチ
ガード ＦＣ−５１０２」）０．５部、ポリビニルアル
コール（ケン化度９９モル％、平均重合度１８００）５
部及び水２００部を混合して混合液を得た後、かかる混
合液と１００部の半水石膏を混合して泥状物として、３
００ｍｍ×３００ｍｍ×１０ｍｍの型枠に流し込んで、
常温で２４時間放置後に型枠から取り出して、１５０℃
で２時間加熱乾燥して、板状の本発明の石膏硬化物を得
た。The present invention will be described below in more detail with reference to examples. Unless otherwise noted, "%",
“Parts” indicate weight standards. Example 1 0.5 part of an aqueous emulsion of a fluorine compound (perfluoroalkyl acrylate-perfluoroalkyl urethane copolymer, solid content 20%; "Scotchguard FC-5102" manufactured by Sumitomo 3M Limited), polyvinyl alcohol (degree of saponification 99) Mol%, average degree of polymerization 1800) 5
And 200 parts of water were mixed to obtain a mixed solution, and then the mixed solution and 100 parts of hemihydrate gypsum were mixed to obtain a muddy substance.
Pour into a 00mm × 300mm × 10mm formwork,
After leaving at room temperature for 24 hours, it was taken out of the
For 2 hours to obtain a plate-shaped cured gypsum product of the present invention.
【００１５】得られた石膏硬化物について、以下の評価
を行った。 （撥水性）４５度に傾斜させた石膏硬化物の表面に水滴
を落下させて、状況を目視観察して、以下の通り評価し
た。 ◎ −−− 水滴が直ぐに流れ落ちた ○ −−− 水滴がゆっくりと流れ落ちた △ −−− 水滴が石膏硬化物上に留まった × −−− 水滴が石膏硬化物に浸透してしまった （防汚性）得られた石膏硬化物の表面に水性インクを２
〜３滴落として、室温で１時間放置後にその表面を水道
水で洗い流して、その表面状況を目視観察して、以下の
通り評価した。 ◎ −−− 水性インクの痕跡が全く認められなかった ○ −−− 水性インクの痕跡がほとんど認められなか
った △ −−− 水性インクの付着がわずかに見られた × −−− 水性インクの付着が見られたThe cured gypsum obtained was evaluated as follows. (Water repellency) A water drop was dropped on the surface of the cured gypsum material inclined at 45 degrees, and the situation was visually observed and evaluated as follows. ◎ −−− Water droplets flowed down immediately ○ −−− Water droplets flowed down slowly △ −−− Water droplets remained on the hardened gypsum × −−− Water droplets penetrated into the hardened gypsum (antifouling 2) aqueous ink on the surface of the cured gypsum
After dropping ３3 drops and leaving at room temperature for 1 hour, the surface was washed away with tap water, and the surface condition was visually observed and evaluated as follows. ◎ −−− No trace of water-based ink was observed at all ○ −−− Little trace of water-based ink was observed △ −−− Slight adhesion of water-based ink was observed × −−− Adhesion of water-based ink has seen
【００１６】（寸法安定性）得られた石膏硬化物を４０
℃の温水に浸せき後、２０℃で放置し、再度浸せき及び
放置を繰り返して、平面部分（３００ｍｍ×３００ｍ
ｍ）の最初の温水浸せき処理前に対する面積変化を調べ
て、以下の通り評価した。 ○ −−− 面積変化が±０．０５％以内 △ −−− 面積変化が±０．０５〜０．１％以内 × −−− 面積変化が±０．１％を越える （湿潤時の機械的強度）得られた石膏硬化物を２０℃、
６５％ＲＨの条件で５時間放置後に曲げ強度（乾燥強
度）を測定し、別途得られた石膏硬化物を３０℃、１０
０％ＲＨの条件で５時間放置後に同じく曲げ強度（湿潤
強度）を測定して、以下の通り評価した。 ○ −−− 湿潤強度が乾燥強度の８０％以上 △ −−− 湿潤強度が乾燥強度の４０〜８０％未満 × −−− 湿潤強度が乾燥強度の４０％未満(Dimensional stability)
Immersed in warm water at 20 ° C., left at 20 ° C., and repeated immersion and standing again to obtain a flat part (300 mm × 300 m
m) was examined for the change in area before the first hot water immersion treatment, and evaluated as follows. ○ −−− Area change is within ± 0.05% △ −−− Area change is within ± 0.05 to 0.1% × −−− Area change exceeds ± 0.1% Strength) The obtained gypsum cured product is heated at 20 ° C.
After being left for 5 hours under the condition of 65% RH, the bending strength (drying strength) was measured.
After standing at 0% RH for 5 hours, the bending strength (wet strength) was measured in the same manner and evaluated as follows. ○ −−− Wet strength is 80% or more of dry strength △ −−− Wet strength is less than 40 to 80% of dry strength × −−− Wet strength is less than 40% of dry strength
【００１７】実施例２ 実施例１において、フッ素系化合物の水系エマルジョン
をパーフルオロアルキルアクリレートコポリマー（固形
分３０％；住友スリーエム社製「スコッチガード ＦＣ
−２５１」）０．５部とした以外は同様に行って、石膏
硬化物を得て、同様に評価を行った。Example 2 In Example 1, an aqueous emulsion of a fluorine compound was used as a perfluoroalkyl acrylate copolymer (solid content: 30%; "Scotchguard FC" manufactured by Sumitomo 3M Limited).
-251 ") A gypsum cured product was obtained in the same manner except that the amount was changed to 0.5 part.
【００１８】実施例３ 実施例１において、フッ素系化合物の水系エマルジョン
１．５部とポリビニルアルコール１５部の混合液を用い
た以外は同様に行って、石膏硬化物を得て、同様に評価
を行った。Example 3 A cured gypsum product was obtained in the same manner as in Example 1 except that a mixture of 1.5 parts of an aqueous emulsion of a fluorine-based compound and 15 parts of polyvinyl alcohol was used. went.
【００１９】実施例４ 実施例１において、ポリビニルアルコール系樹脂とし
て、ケン化度８８モル％、平均重合度６００のポリビニ
ルアルコールを用いた以外は同様に行って、石膏硬化物
を得て、同様に評価を行った。Example 4 A cured gypsum product was obtained in the same manner as in Example 1 except that polyvinyl alcohol having a saponification degree of 88 mol% and an average polymerization degree of 600 was used as the polyvinyl alcohol-based resin. An evaluation was performed.
【００２０】実施例５ 実施例１において、半水石膏とポリビニルアルコールを
粉体で混合後、これをフッ素系化合物の水系エマルジョ
ン中に投入・混合して泥状物とした以外は同様に行っ
て、石膏硬化物を得て、同様に評価を行った。Example 5 The procedure of Example 1 was repeated, except that hemihydrate gypsum and polyvinyl alcohol were mixed in powder form, and then added and mixed into an aqueous emulsion of a fluorine-based compound to form a mud. , A cured gypsum product was obtained and evaluated in the same manner.
【００２１】実施例６ 実施例１において、フッ素系化合物の水溶液を添加せず
に石膏硬化物を得た後、該硬化物の表面にかかる水溶液
を固形分換算で１０ｇ／ｍ2になるように塗布して、乾
燥させて石膏硬化物を得て、同様に評価を行った。Example 6 In Example 1, after a cured gypsum product was obtained without adding an aqueous solution of a fluorine-based compound, the aqueous solution on the surface of the cured product was adjusted to have a solid content of 10 g / m 2. It was applied and dried to obtain a gypsum cured product, which was similarly evaluated.
【００２２】比較例１ 実施例１において、フッ素系化合物を用いなかった以外
は同様に行って、石膏硬化物を得て、同様に評価を行っ
た。実施例及び比較例の評価結果を表１に示す。Comparative Example 1 A cured gypsum product was obtained in the same manner as in Example 1 except that no fluorine-based compound was used. Table 1 shows the evaluation results of the examples and the comparative examples.
【００２３】[0023]
【表１】 撥水性 防汚性 寸法安定性 湿潤時の機械的強度 実施例１ ○ ○ ○ ○ 〃 ２ ○ ○ ○ ○ 〃 ３ ○ ○ ○ ○ 〃 ４ ○ ○ ○ ○ 〃 ５ ○ ○ ○ ○ 〃 ６ ◎ ◎ △ △ 比較例１ × × × × [Table 1] Water repellency Antifouling property Dimensional stability Mechanical strength when wet Example 1 ○ ○ ○ ○ 〃 2 ○ ○ ○ ○ 〃 3 ○ ○ ○ ○ ○ ４ 4 ○ ○ ○ ○ ○ ５ 5 ○ ○ ○ ○ 〃 6 ◎ ◎ △ △ Comparative Example 1 × × × ×
【００２４】[0024]
【発明の効果】本発明の石膏硬化物は、撥水性、防汚
性、寸法安定性、湿潤時の機械的強度等に優れ、建築用
の石膏ボード、石膏プラスター等に有用である。The gypsum cured product of the present invention is excellent in water repellency, antifouling property, dimensional stability, mechanical strength when wet, and the like, and is useful for gypsum boards and gypsum plasters for construction.
Claims (4)
フッ素系化合物を含有してなることを特徴とする石膏硬
化物。1. A cured gypsum product comprising gypsum, a polyvinyl alcohol resin and a fluorine compound.
ッ素系化合物及び水を混練して泥状物とした後に硬化さ
せたことを特徴とする請求項１記載の石膏硬化物。2. The cured gypsum product according to claim 1, wherein the gypsum, the polyvinyl alcohol-based resin, the fluorine-based compound and water are kneaded into a muddy material and then cured.
水を混練して泥状物として硬化させた後にその表面にフ
ッ素系化合物を塗布或いは含浸させたことを特徴とする
請求項１記載の石膏硬化物。3. The cured gypsum product according to claim 1, wherein the gypsum, the polyvinyl alcohol-based resin and water are kneaded and cured as a mud, and then the surface thereof is coated or impregnated with a fluorine-based compound. .
徴とする請求項２または３記載の石膏硬化物。4. The gypsum cured product according to claim 2, wherein the fluorine compound is an aqueous liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35730198A JP2000178064A (en) | 1998-12-16 | 1998-12-16 | Gypsum hardened body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35730198A JP2000178064A (en) | 1998-12-16 | 1998-12-16 | Gypsum hardened body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000178064A true JP2000178064A (en) | 2000-06-27 |
Family
ID=18453427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35730198A Pending JP2000178064A (en) | 1998-12-16 | 1998-12-16 | Gypsum hardened body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000178064A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001034534A3 (en) * | 1999-11-12 | 2002-02-07 | Nat Gypsum Properties Llc | Gypsum wallboard and method of making same |
| EP1262464A1 (en) * | 2001-05-29 | 2002-12-04 | 3M Innovative Properties Company | Grout powder having been admixed with a fluorochemical compound |
| WO2007122804A1 (en) | 2006-04-21 | 2007-11-01 | Next21 K.K. | Figure-forming composition, process for production of figures in three dimensions by using the composition and process for production of three-dimensional structures |
| JP2019131435A (en) * | 2018-01-31 | 2019-08-08 | 学校法人福岡大学 | Gypsum molded article and manufacturing method therefor, and construction material including the gypsum molded article |
-
1998
- 1998-12-16 JP JP35730198A patent/JP2000178064A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001034534A3 (en) * | 1999-11-12 | 2002-02-07 | Nat Gypsum Properties Llc | Gypsum wallboard and method of making same |
| EP1262464A1 (en) * | 2001-05-29 | 2002-12-04 | 3M Innovative Properties Company | Grout powder having been admixed with a fluorochemical compound |
| WO2002096822A1 (en) * | 2001-05-29 | 2002-12-05 | 3M Innovative Properties Company | Grout powder containing a fluorochemical compound |
| US7704600B2 (en) | 2001-05-29 | 2010-04-27 | 3M Innovative Properties Company | Grout powder containing a fluorochemical compound |
| WO2007122804A1 (en) | 2006-04-21 | 2007-11-01 | Next21 K.K. | Figure-forming composition, process for production of figures in three dimensions by using the composition and process for production of three-dimensional structures |
| US8105517B2 (en) | 2006-04-21 | 2012-01-31 | Next21 K.K. | Figure-forming composition, method for forming three-dimensional figures and three-dimensional structures by using the same |
| JP2019131435A (en) * | 2018-01-31 | 2019-08-08 | 学校法人福岡大学 | Gypsum molded article and manufacturing method therefor, and construction material including the gypsum molded article |
| JP6999167B2 (en) | 2018-01-31 | 2022-01-18 | 学校法人福岡大学 | A gypsum molded body and a method for manufacturing the same, and building materials including the gypsum molded body. |
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